Note 11 - Fair Values (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale, Total	$ 603,638,000	$ 592,743,000
Mortgages Held-for-sale, Fair Value Disclosure	$ 13,300,000	16,700,000
Real Estate Dependent Loans and Foreclosed Assets Estimated Selling Costs [Member]
Fair Value Inputs, Discount Factor	10.00%
Maximum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value Inputs, Discount Factor	25.00%
Maximum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value Inputs, Discount Factor	50.00%
Minimum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Commercial Real Estate [Member]
Fair Value Inputs, Discount Factor	15.00%
Minimum [Member] | Real Estate Dependent Loans and Foreclosed Assets [Member] | Residential Real Estate [Member]
Fair Value Inputs, Discount Factor	25.00%
Municipal General Obligation Bonds [Member]
Debt Securities, Available-for-Sale, Total	$ 137,673,000	137,594,000
Fair Value, Inputs, Level 1 [Member]
Debt Securities, Available-for-Sale, Total	0	0
Fair Value, Inputs, Level 3 [Member] | Municipal General Obligation Bonds [Member] | Maximum [Member]
Debt Securities, Available-for-Sale, Decrease Due to Scheduled Maturities	100,000
Available-for-Sale Securities [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount, Ending Balance	$ 0	$ 0